The municipality was created in October 5th, 1989 and installed on January 1, 1993. It was elevated to the status of municipality and district with the name of the Lagoa do Tocantins, by state law No. 251 of 1991, amended its limits by state law No. 498 of 1992, separated from the municipality of Santa Teresa do Tocantins. The official area of the municipality of Lagoa do Tocantins currently 912km² and the 2010 census, listed with 3.525 inhabitants, with a population growth of around 7.50% compared to the census of 2000.
